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2. Arago's rotations - Wikipedia

   en.wikipedia.org/wiki/Arago's_rotations

   Arago's rotations is an observable magnetic phenomenon that involves the interactions between a magnetized needle and a moving metal disk. The effect was discovered by François Arago in 1824. At the time of their discovery, Arago's rotations were surprising effects that were difficult to explain.

3. Euler's Disk - Wikipedia

   en.wikipedia.org/wiki/Euler's_Disk

   Computer rendering of Euler's Disk on a slightly concave base Video of a rolling Euler’s disk (1:39 min.) Euler's Disk, invented between 1987 and 1990 by Joseph Bendik, [1] is a trademarked scientific educational toy. [2] It is used to illustrate and study the dynamic system of a spinning and rolling disk on a flat or curved surface.

4. Flip-disc display - Wikipedia

   en.wikipedia.org/wiki/Flip-disc_display

   The flip-disc display (or flip-dot display) is an electromechanical dot matrix display technology used for large outdoor signs, normally those that will be exposed to direct sunlight. Flip-disc technology has been used for external destination signs on buses and trains across North America , Europe and Australia , as well as for variable ...

5. California health department reports possible bird flu case ...

   www.aol.com/news/california-health-department...

   By Leah Douglas and Julie Steenhuysen (Reuters) -California's public health department reported a possible case of bird flu in a child with mild respiratory symptoms on Tuesday, but said there was ...

6. Magnetic particle clutch - Wikipedia

   en.wikipedia.org/wiki/Magnetic_particle_clutch

   A magnetic particle clutch is a special type of electromagnetic clutch which does not use friction plates. Instead, it uses a fine powder of magnetically susceptible material (typically stainless steel ) to mechanically link an otherwise free-wheeling disc attached to one shaft, to a rotor attached to the other shaft.

7. Woman accused of stabbing postal worker over spot in NYC deli ...

   www.aol.com/woman-accused-stabbing-postal-worker...

   The woman accused of stabbing a postal worker to death over a spot in line at a Harlem deli has a long history of knife violence — and once threatened “to cut” one of her previous victims.

8. US appeals court halts enforcement of anti-money laundering law

   www.aol.com/news/us-appeals-court-halts...

   By Nate Raymond (Reuters) -A U.S. appeals court has halted enforcement of an anti-money laundering law that requires corporate entities to disclose the identities of their real beneficial owners ...

9. Gaussian beam - Wikipedia

   en.wikipedia.org/wiki/Gaussian_beam

   The equations below assume a beam with a circular cross-section at all values of z; this can be seen by noting that a single transverse dimension, r, appears.Beams with elliptical cross-sections, or with waists at different positions in z for the two transverse dimensions (astigmatic beams) can also be described as Gaussian beams, but with distinct values of w 0 and of the z = 0 location for ...